COMMENTS: I expect that this ejecta will probably graze the earth magnetosphere.
Therefore, the observed disturbance may not be a MC but rather a complex ejecta or a cloud-like structure.
The Bz component in the front part of the MC (if any) is expected to be northwardly directed.
A moderate storm can, however, be caused by the possible negative Bz in the trailing part of the MC.
CME's Source Region is NOAA AR0905 ; P0= 19.536970; Day of Year # 238
CME Appeared at 6 Solar Radii on 20060826 at 2142 UT